Java Matcher appendReplacement(StringBuffer, String)用法及代碼示例

Matcher類的appendReplacement(StringBuffer，String)方法的行為與append-and-replace方法相同。此方法讀取輸入字符串，並將其替換為匹配字符串中的匹配模式。

用法:

public Matcher 
    appendReplacement(StringBuffer buffer, 
                      String stringToBeReplaced)

參數：此方法有兩個參數：

buffer：是存儲目標字符串的StringBuffer。
stringToBeReplaced：這是匹配器中要替換的字符串。

返回值：此方法返回一個Matcher，其中替換了目標String。

異常：此方法引發以下異常：

IllegalStateException：如果尚未嘗試匹配，或者先前的匹配操作失敗
IllegalArgumentException：如果替換字符串指向模式中不存在的named-capturing組
IndexOutOfBoundsException：如果替換字符串指向模式中不存在的捕獲組

下麵的示例說明Matcher.appendReplacement()方法：

範例1：

// Java code to illustrate appendReplacement() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(Geeks)"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GeeksForGeeks Geeks for For Geeks Geek"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        System.out.println("Before Replacement:"
                           + stringToBeMatched); 
  
        // Get the String to be replaced 
        String stringToBeReplaced = "GEEKS"; 
        StringBuffer buffer = new StringBuffer(); 
  
        // Replace every matched pattern 
        // with the target String 
        // using appendReplacement() method 
        while (matcher.find()) { 
            matcher.appendReplacement(buffer, 
                                      stringToBeReplaced); 
        } 
        matcher.appendTail(buffer); 
  
        // Print the replaced matcher 
        System.out.println("After Replacement:"
                           + buffer.toString()); 
    } 
}

輸出：

Before Replacement:GeeksForGeeks Geeks for For Geeks Geek
After Replacement:GEEKSForGEEKS GEEKS for For GEEKS Geek

範例2：

// Java code to illustrate appendReplacement() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(FGF)"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "FGF FGF FGF FGF"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        System.out.println("Before Replacement:"
                           + stringToBeMatched); 
  
        // Get the String to be replaced 
        String stringToBeReplaced = "GFG"; 
        StringBuffer buffer = new StringBuffer(); 
  
        // Replace every matched pattern 
        // with the target String 
        // using appendReplacement() method 
        while (matcher.find()) { 
            matcher.appendReplacement(buffer, 
                                      stringToBeReplaced); 
        } 
        matcher.appendTail(buffer); 
  
        // Print the replaced matcher 
        System.out.println("After Replacement:"
                           + buffer.toString()); 
    } 
}

輸出：

Before Replacement:FGF FGF FGF FGF
After Replacement:GFG GFG GFG GFG

參考： https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#appendReplacement-java.lang.StringBuffer-java.lang.String-

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